Additively manufactured aluminium nested composite hybrid rocket fuel grains with breathable blades

Hybrid rocket engines suffer from the restricted mechanical properties and low regression rates of current polymeric fuel grains. We propose a three-dimensional printed aluminium (Al) nested composite grain with millimetre-scale lattice pores (referred to as Al-L). In this study, breathable Al blades micrometer-scale interconnected (Al-B) combining (Al-B&L) are designed. The formation mechanisms, characteristics, effects analysed in simulations, micro-computed tomography, cyclic compression tests. grains investigated numerically Al-B has highest Young’s modulus at more than 15 times that paraffin-based Al-B&L yield stress 4 grain. Referring combustion properties, respectively 63.3% 58.2% greater rate